1. Structure of the Injection Molding Machine Nozzle

The nozzle for an injection molding machine, also known as the injection nozzle, is the component attached to the cylinder. The connection between the nozzle and the cylinder comes in two types, depending on the specific design of the cylinder.

+ Directly mounted using either a bolted joint or a threaded connection.
+ Indirectly mounted via a nozzle adapter, meaning the nozzle is attached to the adapter, and the adapter is then connected to the cylinder.

The main function of the nozzle (injection head) is to channel the molten plastic into the mold. The nozzle makes direct contact with the entry point of the mold. Additionally, depending on specific cases, it may serve other purposes as well.

Loại thông dụng

Special Types of Injection Nozzles

• Trộn nhựa (Mixing nozzle): When the produced product has a color (other than black, white, or clear), the issue of uneven mixing of colorants with the plastic can lead to inconsistent color in the final product. The nozzle plays a key role in mixing the plastic and colorant to ensure uniform color distribution and consistent product appearance. Mixing nozzle will create a swirling molten plastic flow, which helps to mix the colored plastic more evenly and improve the color stability of the product. To address the issue of uneven color mixing and color streaking, ASG offers the solution of using a mixer nozzle. These mixer nozzles are typically designed to be cleaned without disassembly, and the cleaning process is done by purging with new polymer. Thanks to the optimized nozzle design, there are no residues or dead zones, ensuring that the plastic and colorant mix completely after just a few injection cycles. This effectively prevents unnecessary material loss and reduces the time needed to clean the plastic in the machine.

  

• Shut-off nozzle: The shut-off nozzle is different from a standard nozzle because it can block the flow of molten plastic when not injecting. It is suitable for use with low-viscosity plastics that are prone to leaking from the nozzle. With years of design experience, ASG will consult with customers and provide the most optimal design for each type of injection molding machine. There are two types of shut-off nozzles: self-adjusting and externally adjustable.
  1. Self-Adjusting Nozzle: The injection needle is kept in place by a spring pressure, which closes the nozzle. When the injection pressure increases, the molten plastic pushes the needle backward, opening the nozzle. Once the plastic inside the nozzle reaches a certain pressure, it successfully pushes the needle back. As a result, there will be a minimum pressure required to overcome the spring force and open the nozzle. When the nozzle opens, the pressure will decrease, and the spring-driven needle will close the nozzle hole.

  

  2. Externally Adjustable Nozzle: The nozzle is opened by an external force, independent of the plastic flow pressure. The nozzle's shut-off function is controlled hydraulically or pneumatically. These types of nozzles have various mechanisms to stop the flow. Since they operate independently of the plastic flow pressure, they can be used for a wide range of applications such as pre-melt compression, physical and chemical foaming, and high-speed injection molding.

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2. Manufacturing Scope

• We manufacture all types of nozzles for injection molding machines according to customer specifications.
  •  Diameter from D12mm –  D200mm

3. Application

• Glass content in plastic 0%GF to 65%GF.
• The type of plastic that the customer uses
• Non-corrosive plastic: PET, PP, PC, ABS…
• Corrosive plastic: PA, PA6. PA9T, PPS, LCP…
• High-viscosity transparent plastic: clear PC, colored PC.
• High hardness plastic: Bakelite.

4. Manufacturing method

Using high strength alloys, heat treated in a vacuum environment, creating products with the highest mechanical properties of carefully selected steels for manufacturing. Important parts of the components are reinforced with special alloys to increase component life.

5. Product supply process

Step 1: Please send us a quote request including the following information:

• Full model name or model photo
• Component diameter and length specifications.
• Use plastic models or plastic packaging photos to select appropriate materials and component manufacturing technology.

Step 2 ASG Vietnam sends quotation to you.

Step 3: Customer send order.

Step 4: In most cases we have manufacturing drawings, in some cases we do not have drawings, we will come to your factory to measure and create drawings.

Bước 5: Production and product quality control according to ISO 9001:2005 standards.

Bước 6: Delivery

Bước 7: Payment of order value.

4. Warranty Terms

1 year warranty for all components.

ASG screw cylinder – quality creates trust